Discharge valve for tank cars



Dec. 25, 1934. G. F, GERD-rs 1,985,858

DISCHARGE VALVE FOR TANK CARS Fled June 29, 1931 W/TNESS (5y yea/gg@ which are positively operated by a simple screw f Patented Dec. `25, 1934y 1,985,858 DISCHARGE VALVE FOR TANK CARS Gustav Friedrich Gerrits, Bremen, Germany Application June 29, 1931, Serial No. 547,757 In Germany June 26, 1930 4 Claims.

lThe object of the invention is to provide an eflicient device for drawing off the contents of containers or tanks on vehicles through two adjacently superposed openings the valve bodies `of means in such a manner that these two valve bodies when moved to open or to close recede from or` approach each other, respectively, whilst a strainer is placed over the inlet openingfcontrollable through a corresponding movement of the valve stem, to retain any solid matter in the tank and to prevent the same from interfering with the proper function of the device. y

The invention consists, further, in the peculiar arrangement, construction and combination of parts which permit of readily dismounting and removing through an auxiliary opening below the inlet opening the valve stem with the two valve bodies, their seats and also the strainer,

l to be able to examine and regi-incl the valve seats and to thoroughly clean all of the parts, thus, without any one having to enter the tank for this purpose, therefore, without having to steam or otherwise clean the interior of the tank to free it from obnoxious gases, as now required.

To this end provision is made, in a casing, of an annular valve seat member within an annular holding member for supporting and guiding two coaxial valve bodies and also -means for operatively moving the valve bodies towards or from each other Without turning the same.

The discharge valve consists then, according to the invention, of a plain casing, of a self-contained operating element disposed to be easily introduced` into and removed, in itsk entirety, from the valve casing through an auxiliary opening in the lower part of the same, as well as of a plate or cap to cover and close this opening.

Other objects and advantages relate to the details of construction of the device, all as will more fully appear from the following description, taken in connection with the accompanying drawings, in which: i

Figure l is a sectional view of the valve structure.

Fig. 2 is a sectional view of the same on a vertical plane at right angles to that shown in Fig. 1. Y

As shown in the drawings, valve stem 1 passes revolubly through upper valve body 2 and screwably engages lower valve body 6 for forcing their seating partsv onto those at both ends of the annular valve seat member 31 which is tightly supported by and within the annular holding member 15.

Ribs 22 on the upper valve body 2 are adapted to vertically slidably engage pins 21 on the valve seat member 31, whilst the lower valve body 6 is provided with ribs 24 for vertically slidably engaging ribs 33 on the annular holding member 15,

`whereby the valve bodies are prevented from turning when being operated to positively open land close the valve openings.

A collar, as 34, serves to lift the upper valve body after the lower one has been brought to its lowest position, whilst the upper valve body is forced to its seat by tapering shoulder 23 on the valve stem.

A strainer, as 26, is normally supported by the annular member 15 from which it may be raised and be returned to its normal position by the collars 25 and 27, respectively, the distance of these collars, from each other being such that the strainer can be raised suitably to discharge the sludge only after the valves have been more than fully opened .to discharge the oil. The valve stem is usually turned by means of a hand wheel, as 18, Figure 3, which is confined in a locked cage to prevent tampering with the same. After taking olf cap 7 and then unscrewing annular member 15 the complete operating element can be lowered out of the valve casing on the tank, thus leaving only the plain valve casing on the tank, when any large accumulation of sludge, et cetera, can easily be removed through the auxiliary opening. Where both valve bodies are being prevented from turning, valve seats of a more or less yielding material may be made use of, as shown by the packing rings 19 and 20, Figures 4 and 5.

What I claim is:

1. A discharge valve for tank cars having a casing with inlet and outlet openings, and an annular holding member secured to the casing from below and two co-axial valve bodies, characterized by an annular valve seat member within the annular holding member for supporting and guiding the two co-axial valve bodies and means for operatively moving the valve bodies `withoutturning the same.

2. A valve as claimed in claim 1,`characterized by means for operating the valve bodies, com- `prising, a valve stem turnable in the upper valve body `and screwable in the lower valve body, and projections on the said two valve bodies adapted to slidably engage suitable projections on the said two annular members.

3. A valve as claimed in claim 1, characterized by a strainer normally supported by the annular holding member and means on the valve stem for vlifting the strainer off its support to discharge the sludge only after the valve has been normally opened tddischarge the oil.

4. `A valve as claimed in claim 1, characterized by a strainer normally supported by the annular holding member and means for lifting and lowering the, strainer, comprising, two collars on the valve stem for limitedly moving the strainer off and onto the annular holding member.

GUSTAV FRIEDRICH GERDTS.

cmmmci'rm or CORRECTION P atent No. 1,985,858. December 25, 1934.

Gustav Friedrich Gerdts.

It s hereby certified that error appeers in the above numbered patent requiring correction as follows: In the drawingm Figs. 1 and 2, should appear as shown below instead of as shown l in the patent- L and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 26th dw of Mrch, A. D. 1935- Leslie Frazer (Seal) Acting Gomis-stoner of Patente, 

